Method of making compound cutter-bars.



UNITED, STATES I PATENT, OFFICE.

'JOSEPH BEDF-ORD AND JOSEPH ASHTON, OF SHEFFIELD, ENGLAND, As. SIGNORS 0F ONE-HALF: TO WILLIAM H. Bassoon, or WASHINGTON,

DISTRICT OF COLUMBIA.

METHOD OF MAKING COMPOUND CUTTER-BARS.

SPElJIFlIGATION forming part of Letters Patent No. 653,165, dated July 3, 1900.

Original application filed N m r 8, 1897, Serial No. 657.792. Divided and this application filed October 27, 1899. Serial a No. 734,904. (No modcL) To all whom it may concern;

Be it known that we, JOSEPH BEDFORD and J OSEPH ASHTON, citizens of Great Britain, residing at Sheffield, in the county of York, England, have invented certain new and useful Improvements in the Production of Compound Steel'Bars for Making Cutting-Tools and the Like and we do hereby declare the.

following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to the production of bars composedof a superior quality of cast-' steel inclosed' or partially surrounded by a greater body of cheaper steel or iron to give the requisite support and firmness to the highergrade steel when put into use as a tool.

The principal object is to provide a tool of cost of niaterialand labor.

To carryour invention into effect, we make from the requisite quality of cast-steel a comparatively-small bar of any desired shape or maximum grade or quality at a minimum section, which maybe, say,square,;flat, dou- .said groove'while the larger piece is still hot,

or'they may be put together with both bars cold, in which latter case the compound bar is to be put into a furnace. In either case the bar is to be finished without welding or solderingby pressure of rolls or by hammering. in the manner ordinarily practiced for tool-bars.

The compound bar'so produced may be fashioned as an integral tool-bar for the class of work to be done practically as if from an ordinary bar of steel.

The accompanying drawings illustrate the method of procedure to obtain bars suitable for making tools.

finished bar, the cast-steel having eonca'ved sides. steel having grooves in its sides, and Fig. 4 shows in perspective a tool formed from'such a compound unwelded integral bar and ready foru'se.

On reference. to Fig.1 it will be apparent that the groove in the rough barA would receive any section of cast-steel of corresponding dimensions. A piece 13 having been in sorted, the compound bar is to be finished to Fig. 3is a similar section, the castf the required size and shape-say as per Figs.

2 and 3-by pressure of rolling or hammering.

The softer metal in any case will conform to the outlineof the harder cast-steel and when" -cold will have a secure and firm grip upon and contactwith the cast-steel. The tool Fig. 4 may be forged and finished enactly as if from solid steel. a

We would have it understood that we do not confine ourselves to the exact shapes or proportions of materials herein illustrated,

as our method is capable of great variation and adaptation to. meet practical needs. It will he observed from the description and drawings that the harder bar of inserted 'metal is so shaped that upon pressure the softer inclosing bar will by conforming to the shape of the harder bar overlap parts of it, so asto form a more secure and solid article.

Having thus fully described our invention, what we claim asnew, and desire to secure by Letters Patent, isv a The method or process of forming a compound integral bar of metal suitable for'niaking cutting-tools without casting or welding, consisting in placing a harder bar of a qual- .ity incapable of being welded within a groove 

